High reliability drug infusion device

ABSTRACT

A high reliability drug infusion device, includes: a drug storage unit including a drug outlet; a screw connected to a piston and a driving wheel provided with wheel teeth, respectively, the driving wheel drives the screw to move by rotation, pushing the piston forward; at least one driving unit cooperating with the driving wheel, the driving unit includes at least one driving portion a power unit and a reset unit connected to the driving unit, and the reset unit includes an elastic reset component and a linear-actuated reset component, and the elastic reset component alone applies a force to or together with the linear-actuated reset component to control the reset movement of the driving unit. The high reliability drug infusion can be used for improving the reliability and increasing the user&#39;s flexibility in choosing the infusion method.

TECHNICAL FIELD

The present invention mainly relates to the field of medical instruments, in particular to a high reliability drug infusion device.

BACKGROUND

A drug infusion device can continuously deliver drug into a patient's body for disease treatment. Drug infusion devices are widely used in the field of diabetes treatment, which continuously infuse required dosage of insulin into the patient's subcutaneous tissue, thereby simulating the secretion function of the pancreas to keep the blood glucose stable. The drug fluid is usually stored inside the infusion pump. The existing drug infusion device, controlled by remote device, is usually attached directly on the patient's skin through a medical adhesive tape.

At present, the infusion device in prior art is prone to that the infusion method is relatively simple. So the user cannot choose and control flexibly, and the driving components are prone to failure. Therefore, the drug cannot be infused into the body in time, which affects the user's health and has potential safety hazards.

Therefore, the prior art urgently needs a high reliability drug infusion device with higher reliability and being controlled flexibly.

BRIEF SUMMARY OF THE INVENTION

Embodiments of the present invention disclose a high reliability drug infusion device in which the reset unit includes both an elastic reset component and a linear-actuated reset component. The elastic reset component can operate alone or cooperate with the linear-actuated reset component to improve the reliability of the infusion device and increase the user's flexibility in choosing the infusion method.

The invention discloses a high reliability drug infusion device, comprising: a drug storage unit including a drug outlet; a screw connected to a piston and a driving wheel provided with wheel teeth, respectively, the driving wheel drives the screw to move by rotation, pushing the piston, provided in the drug storage unit, forward; at least one driving unit cooperating with the driving wheel, the driving unit includes at least one driving portion; a power unit and a reset unit connected to the driving unit, and the reset unit includes an elastic reset component and a linear-actuated reset component, and the elastic reset component alone applies a force to or together with the linear-actuated reset component to control the reset movement of the driving unit, wherein: when the power unit outputs a force on the driving unit, the driving unit rotates around a pivot shaft, driving the driving portion to push the wheel teeth, thus rotating the driving wheel; when the reset unit outputs a force on the driving unit alone, the driving unit performs a reset rotation without the driving portion pushing the wheel teeth, thus making the driving wheel stop rotating; and an infusion tube, used as a drug infusion channel, includes a connection end and a subcutaneous end, and when the connection end is connected with the drug outlet and the subcutaneous end enters the subcutaneous, the drug is delivered subcutaneously through the infusion tube.

According to one aspect of this invention, the driving unit includes two driving portions, and under the cooperative operation of the power unit and the reset unit, the two driving portions can alternately push the wheel teeth.

According to one aspect of this invention, the two driving portions alternately push the wheel teeth disposed on the same driving wheel.

According to one aspect of the present invention, the driving wheel includes two sub-wheels provided with wheel teeth, and the two driving portions respectively alternately push the wheel teeth disposed on different sub-wheels.

According to one aspect of the invention, the power unit and the linear-actuated reset component are electrically driven linear actuator or electrically heated linear actuator.

According to one aspect of the invention, the linear actuator includes a shape memory alloy.

According to one aspect of the present invention, the elastic reset component at least includes a spring, an elastic sheet, an elastic plate, an elastic rod, or elastic reset rubber.

According to one aspect of the present invention, the driving unit includes one driving portion, and the elastic reset component is a spring.

According to one aspect of the present invention, it further comprises a transitional connection member which is disposed outside the drug outlet, and one end of the transitional connection member connects with the drug outlet, while the other end is used to connect the connection end.

According to one aspect of the present invention, the transitional connection member includes a connection cavity or a connection port.

According to one aspect of the present invention, it further comprises a program unit, which is connected to the power unit and the linear-actuated reset component, respectively, and according to the infusion requirements, the program unit controls the output force from the power unit or the linear-actuated reset component.

Compared with the prior arts, the technical solution of the present invention has the following advantages:

In the high reliability drug infusion device disclosed herein, at least one driving unit cooperating with the driving wheel, the driving unit includes at least one driving portion; a power unit and a reset unit connected to the driving unit, and the reset unit includes an elastic reset component and a linear-actuated reset component, and the elastic reset component alone applies a force to or together with the linear-actuated reset component to control the reset movement of the driving unit. The elastic reset component can operate alone or cooperate with the linear-actuated reset component to improve the reliability of the infusion device and increase the users flexibility in choosing the infusion method. Secondly, the infusion device can switch to the linear-actuated reset component when the elastic reset component fails, improving the reliability of the infusion device. Thirdly, when the power unit outputs a force on the driving unit, the driving unit rotates around a pivot shaft, driving the driving portion to push the wheel teeth, thus rotating the driving wheel; when the reset unit outputs a force on the driving unit alone, the driving unit performs a reset rotation without the driving portion pushing the wheel teeth, thus making the driving wheel stop rotating. The power unit can provide a sufficiently great and stable driving power, which in turn enables the drug infusion device to have a sufficiently great and stable and controllable infusion pressure to avoid drug blockage and eliminate potential safety hazards.

Furthermore, the driving unit includes two driving portions, and under the cooperative operation of the power unit and the reset unit, the two driving portions can alternately push the wheel teeth. Two driving portions pushing the wheel teeth alternately can not only improve the infusion efficiency but also make the infusion device have multiple infusion modes.

Furthermore, linear-actuated reset component are electrically driven linear actuator or electrically heated linear actuator. The force of the linear actuator can be controlled by current. When the current is constant, the force output by the linear actuator is constant. Therefore, the linear actuator can output stable and controllable force, thus making the drug infusion proceed smoothly.

Furthermore, the elastic reset component at least includes a spring, an elastic sheet, an elastic plate, an elastic rod, or an elastic reset rubber. The reset unit can work without consuming additional energy, which reduces the power consumption of the drug infusion device and saves the production cost.

Furthermore, the transitional connection member includes a connection cavity or a connection port, avoiding drug leakage.

Furthermore, the program unit is connected to the power unit and the linear-actuated reset component respectively, and according to the infusion requirements, the program unit controls the output force from the power unit or the linear-actuated reset component. According to the patient's body requirements or the user's operation, the program unit can control the driving structure to implement different driving methods, which increases the flexibility of the infusion process of the infusion device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of the main structures of the drug infusion device according to an embodiment of the present invention;

FIG. 2 a - FIG. 2 c are top views of the driving portion pushing the wheel teeth according to different embodiments of the present invention;

FIG. 3 a - FIG. 3 c are schematic views of the power unit, the reset unit and the driving unit cooperating with each other according to different embodiments of the present invention;

FIG. 4 a - FIG. 4 b are schematic views of that the pulling direction of the power unit is not parallel to the advancing direction of the screw according to another embodiment of the present invention, and FIG. 4 b is the top view of FIG. 4 a;

FIG. 5 is a schematic view of a driving unit including two driving units according to an embodiment of the present invention;

FIG. 6 is a schematic view of a driving unit including two driving units according to another embodiment of the present invention;

FIG. 7 a - FIG. 7 b are schematic views of two driving portions of one driving unit cooperating with two sub-wheels respectively according to yet another embodiment of the present invention;

FIG. 8 a - FIG. 8 b are schematic views of two driving portions of one driving unit cooperate with the same driving wheel according to yet another embodiment of the present invention, and FIG. 8 b is a schematic view of the driving unit in FIG. 8 a;

FIG. 9 a is a schematic view of an assembly structure of a high reliability drug infusion device in an initial position according to one embodiment of the present invention;

FIG. 9 b is a schematic view of an assembly structure of a high reliability drug infusion device in a working position according to an embodiment of the present invention;

FIG. 9 c is a schematic view of the infusion tube provided in an assembly structure according to an embodiment of the present invention;

FIG. 10 is a schematic view of the drug outlet, the transitional connection member and the infusion tube according to an embodiment of the present invention.

DETAILED DESCRIPTION

As described above, the infusion device of the prior art is prone to that the infusion method is relatively simple. So the user cannot choose and control flexibly, and the driving components are prone to failure. Therefore, the drug cannot be infused into the body in time, which affects the user's health and has potential safety hazards.

The study found that the cause of the above problems is that the movement of the driving unit is really simple, so user or program unit cannot flexibly choose infusion method.

In order to solve this problem, the present invention provides a high reliability drug infusion device, and the reset unit includes both an elastic reset component and a linear-actuated reset component. The elastic reset component can operate alone or cooperate with the linear-actuated reset component to improve the reliability of the infusion device and increase the user's flexibility in choosing the infusion method.

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. The relative arrangement of the components and the steps, numerical expressions and numerical values set forth in the embodiments are not to be construed as limiting the scope of the invention.

In addition, it should be understood that, for ease of description, the dimensions of the various components shown in the figures are not necessarily drawn in the actual scale relationship, for example, the thickness, width, length or distance of certain units may be exaggerated relative to other structures.

The following description of the exemplary embodiments is merely illustrative, and is not intended to be in any way limiting the invention and its application or use. The techniques, methods and devices that are known to those of ordinary skill in the art may not be discussed in detail, but such techniques, methods and devices should be considered as part of the specification.

It should be noted that similar reference numerals and letters indicate similar items in the following figures. Therefore, once an item is defined or illustrated in a drawing, it will not be discussed further in the following description of the drawings.

FIG. 1 is a schematic view of main structures in the infusion device according to an embodiment of the present invention.

The internal structure of the infusion device mainly includes a drug storage unit 1110, a piston 1120, a screw 1130, a driving wheel 1140, at least one driving unit 1150, a pivot shaft 1160, a reset unit, a power unit 1180 and an infusion tube (not shown). The infusion tube will be described in detail below. In the embodiment of this present invention, the driving unit 1150 is connected to the reset unit and the power unit 1180, respectively. It should be noted that the connection herein includes mechanical connection or electrical connection.

The drug storage unit 1110 is used for storing liquid drug. Drugs include, but are not limited to, insulin, glucagon, antibiotics, nutrient solutions, analgesics, morphine, anticoagulants, gene therapy drugs, cardiovascular drugs or chemotherapy drugs, etc. And the drug storage unit 1110 includes a drug outlet 20.

The piston 1120 is used to infuse liquid drug into the body.

The screw 1130 is connected to the piston 1120 and the driving wheel 1140, respectively. In the embodiment of the present invention, the driving wheel 1140 advances the screw 1130 forward by screwing, the screw 1130 then forces the piston 1120, arranged in the drug storage unit 1110, to move forward, so as to achieve the purpose of drug infusion.

The peripheral surface of the driving wheel 1140 is provided with wheel teeth 1141. The wheel teeth 1141 are gear teeth or ratchet teeth. Preferably, in the embodiment of the present invention, for improving driving efficiency, the wheel teeth 1141 are ratchet teeth which can be pushed more easily.

At least one driving portion 1151 is provided on the driving unit 1150 to push the wheel teeth 1141, thereby rotating the driving wheel 1140. The driving unit 1150 is movably connected to the pivot shaft 1160. Preferably, in the embodiment of the present invention, the driving unit 1150 includes a driving portion 1151.

The power unit 1180 and the reset unit cooperate with each other to make the driving unit 1150 rotate reciprocally around the pivot shaft 1160, as shown in the R direction in FIG. 1 , thereby making the driving portion 1151 move in the advancing direction and reset direction. When the driving unit 1150 performs one reciprocating rotation, the driving wheel 1140 drives the screw 1130 forward one step, and the screw 1130 engages the piston 1120 to infuse one unit of drug.

The reset unit includes an elastic reset component 1170 a and a linear-actuated reset component 1170 b , that is, an elastic reset component 1170 a and a linear-actuated reset component 1170 b are provided in the infusion device to control the reset movement of the driving portion 1151. In the embodiment of the present invention, first of all, the elastic reset component 1170 a can work alone to control the reset of the driving portion 1151, or can cooperate with the linear-actuated reset component 1170 b to jointly control the reset of the driving portion 1151, increasing the diversity of the reset movement mode of the driving portion 1151, thus improving the flexibility of the infusion device over the driving mode. Secondly, when the elastic reset component 1170 a fails, the infusion device can be switched to the linear-actuated reset component 1170 b to work so as not to affect the infusion. That is, the linear-actuated reset component 1170 b serves as a backup structure of the elastic reset component 1170 a , which improves the reliability of the infusion device. Thirdly, the elastic reset component 1170 a and the linear-actuated reset component 1170 b can work simultaneously and coordinate. The elastic reset component 1170 a has a limited reset power, but the linear-actuated reset component 1170 b can control the magnitude of its output reset power. Therefore, compared with the reset unit with only the elastic reset component 1170 a , with the coordinated cooperation of the elastic reset component 1170 a and the linear-actuated reset component 1170 b , the driving portion 1151 can reset more wheel teeth 1141, making the infusion device have many different infusion modes, such as different infusion rate, different increment, etc. Fourthly, compared with a reset unit with only the linear-actuated reset component 1170 b , the coordination between the two reduces the power consumption while the driving portion 1151 resets, therefore reducing the power consumption of the infusion device.

It should be noted here that the advancing direction of the driving portion 1151 refers to the direction in which the wheel teeth 1141 moves, while the reset direction of the driving portion 1151 is opposite to the advancing direction. During the reset movement, the driving portion 1151 only slides on the surface of the wheel teeth 1141 without pushing them.

The elastic reset component 1170 a at least includes a spring, an elastic piece, an elastic plate, an elastic rod, rubber and other elastic members. It should be noted that the spring herein includes a compression spring, an extension spring, or a torsion spring, etc. Preferably, the elastic reset component 1170 a is a spring. Preferably, in the embodiment of the present invention, the elastic reset component 1170 a is a torsion spring which is more conducive to the reset of the driving unit 1150. When the reset unit is the elastic reset component 1170 a , it can work without consuming additional energy, which reduces the power consumption of the drug infusion device and saves the production cost.

The linear-actuated reset component 1170 b includes an electrically driven linear actuator or an electrically heated linear actuator, such as a shape memory alloy. After being energized, the physical form of the material of the linear actuator, like shape memory alloy, changes, which makes shrinkage deformation of the shape memory alloy occur, thereby outputting the driving force. The higher the current is, the larger the shrinkage deformation of the shape memory alloy occurs, and the greater the driving force outputs. Obviously, when the current is constant, the shrinkage deformation of the linear actuator is also constant, so the driving force is. Therefore, the shape memory alloy can output stable and controllable driving force for drug infusion.

It should be noted that the embodiments of the present invention do not limit the positions of the elastic reset component 1170 a and the linear-actuated reset component 1170 b , as long as the conditions for resetting the driving portion 1151 can be satisfied. The power unit 1180 is an electrically driven linear actuator or an electrically heated linear actuator. By alternately turning on and off, the power unit 1180 outputs force in pulses. Specifically, in the embodiment of the present invention, the power unit 1180 is a shape memory alloy.

Preferably, in the embodiments of the present invention, the infusion device further includes a program unit, which is connected to the power unit 1180 and the linear-actuated reset component 1170 b , respectively, and according to the infusion requirements, the program unit controls the force output by the power unit 1180 or the linear-actuated reset component 1170 b.

FIG. 2 a -FIG. 2 c are top views of the driving portion 1151 pushing the wheel teeth 1141 in different embodiments of the present invention. FIG. 3 a - FIG. 3 c are schematic views of the power unit 1180, the reset unit and the driving unit 1150 cooperating with each other in different embodiments of the present invention.

As shown in FIG. 2 a and FIG. 2 b , in the present invention, only the elastic reset component 1170 a works. So the principle of the reciprocating rotation of the driving unit 1150 in the embodiment of the present invention is as follows. When the power unit 1180 pulls the driving unit 1150 by force Fp, the driving unit 1150 rotates counter-clockwise (advancing direction) around the pivot shaft 1160, driving the driving portion 1151 to push the wheel teeth 1141 forward, and thereby making the driving wheel 1140 rotate. The driving wheel 1140 then moves the screw 1130 forward in D_(A) direction. The elastic reset component 1170 a builds a gradually increasing elastic force F_(R). When the power unit 1180 stops applying force and under the action of only the elastic force F_(R), the driving unit 1150 will rotate clockwise (reset direction) around the pivot shaft 1160. At this time, the driving portion 1151 just slides on the surface of the wheel teeth 1141 instead of pushing them, therefore, the driving wheel 1140 stops rotating. The driving unit 1150 completes one reciprocating rotation.

As shown in FIG. 2 b , in another embodiment of the present invention, the elastic reset component 1170 a and the power unit 1180 are disposed on the same side of the pivot shaft 1160. And according to the general technical principles, those skilled in the art can arbitrarily adjust the positional relationship and the connection relationship of the elastic reset component 1170 a , the driving unit 1150, and the power unit 1180, which is not specifically limited herein, as long as the above-mentioned rotation processes can be achieved.

As shown in FIG. 2 c , in yet another embodiment of the present invention, the elastic reset component 1170 a and the linear-actuated reset component 1170 b work jointly. At this time, the reset unit exerts reset force to the driving unit 1150 alone. The technical principle that the driving portion 1151 pushes the wheel teeth 1141 is consistent with the foregoing. The elastic reset component 1170 a and the linear-actuated reset component 1170 b provide the reset force F_(R) and F_(B) respectively whose directions are opposite with that of F_(P), thereby making the driving unit 1150 rotate reciprocally with the cooperation of the reset unit and the power unit 1180.

It should be noted here that the elastic reset component 1170 a exerts power to the driving unit 1150 alone or the elastic reset component 1170 a cooperating with the linear-actuated reset component 1170 b exerts power refers to that only the reset unit, not the power unit 1180, outputs the power to the driving unit 1150.

Preferably, as shown in FIG. 2 a to FIG. 2 c , in the embodiment of the present invention, the directions of F_(P), F_(R), F_(B) and D_(A) are parallel to one another. This parallel design can make full use of space and optimize the structural relationships inside the infusion device, making internal structure more compact.

Obviously, those skilled in the art can arbitrarily adjust the directions of the F_(P), F_(B) and F_(R) as needed, as long as the conditions for reciprocating rotation of the driving unit 1150 are satisfied, as shown in FIG. 3 a - FIG. 3 c.

In other embodiments of the present invention, the direction of F_(P) and the direction of F_(R) and F_(B) or the direction of D_(A) may not be parallel, which is not specifically limited herein, as long as the purpose of the reciprocating rotation of the driving unit 1150 can be achieved.

FIG. 4 a - FIG. 4 b are schematic views of that the pulling direction of the power unit 1180 is not parallel to the advancing direction of the screw 1130. FIG. 4 b is the top view of FIG. 4 a.

The F_(P) direction of the power unit 1180 is perpendicular to the forward direction D_(A) of the screw 1130. The pivot shaft 1160 is disposed on the base. As described above, the driving unit 1150, rotating reciprocally in the R direction, drives the driving portion 1151 to push the wheel teeth 1141, making the driving wheel 1140 rotate in the W direction and driving the screw 1130 to advance in the D_(A) direction. The driving principle of the driving unit 1150 is consistent with the foregoing embodiment.

In the embodiment of the present invention, blocking walls 1171 and 1172 (as shown in FIG. 1 and FIG. 2 a ) that can stop the driving unit 1150 from rotating are also provided in the infusion device. And an electrical signal may be triggered when the driving unit 1150 contacts the blocking wall 1171 or 1172, allowing the program unit to control the driving force output by the power unit 1180. In another embodiment of the present invention, only the blocking wall 1171 or only the blocking wall 1172 may be provided, so that the rotating terminal in either direction of the driving unit 1150 is controlled by the program unit. The position of the blocking wall 1171 or 1172 is not specifically limited herein, as long as the condition that the driving unit 1150 stops rotating can be satisfied.

In another embodiment of the present invention, no blocking wall is provided (as shown in FIG. 2 b to FIG. 4 b ), and the rotating terminal of the driving unit 1150 is completely controlled by the program unit.

FIG. 5 and FIG. 6 are schematic views of a driving unit including two driving units according to different embodiments of the present invention.

It should be noted that, in order to clearly show the arrangement of the driving unit, the reset units are not all shown in FIG. 5 and FIG. 6 . For the positional relationship between the reset unit and the driving unit, and the working principle of the reset unit, please refer to the foregoing statement.

As shown in FIG. 5 , the driving unit 1250 a rotates reciprocally in the R direction around the pivot shaft 1260 under the action of the linear actuator 1280 a and the reset unit. Similarly, the driving unit 1250 b rotates reciprocally in the R direction around the pivot shaft 1260 under the action of the linear actuator 1280 b and the reset unit. In the embodiment of the present invention, the reciprocating rotations of the two driving units do not interfere with each other. Therefore, both the driving unit 1250 a and the driving unit 1250 b can independently implement the driving method or principle described above.

Preferably, in the embodiment of the present invention, the driving unit 1250 a and the driving unit 1250 b rotate asynchronously. That is, when the driving portion 1251 a of the driving unit 1250 a pushes the wheel teeth 1241 to move, the driving portion 1251 b of the driving unit 1250 b slides on the surface of the wheel teeth 1241. When the driving portion 1251 b slides to one position, the program unit controls the linear actuator 1280 a to stop outputting driving power to the driving unit 1250 a , and in turn controls the linear actuator 1280 b to output power to the driving unit 1250 b . At this time, the driving unit 1250 a rotates in the clockwise direction under the action of the reset unit, and the driving portion 1251 a slides on the surface of the wheel teeth, while the driving portion 1251 b pushes the wheel teeth 1241. The driving units 1250 a and 1250 b are alternately powered to push the same driving wheels 1240.

In the embodiment of the present invention, the pulling force F_(P) of the linear actuators 1280 a and 1280 b , the reset force of the reset units, and the forward direction D_(A) of the screw 1230 are described forgoing. And the direction of the pulling force F_(P) is parallel to the forward direction D_(A) of the screw 1230.

As shown in FIG. 6 , the driving portions 1351 a and 1351 b alternately push the wheel teeth 1341, respectively, and the force output by the linear actuators 1380 a and 1380 b are both controlled by the program unit.

It should be noted that, in the embodiment of the present invention, the direction of the pulling force F_(P)′ of the linear actuator 1380 a and that of the pulling force F_(P)″ of the linear actuator 1380 b are opposite.

Also, in the embodiment of the present invention, the driving units 1350 a and 1350 b rotate asynchronously. That is, when the driving portion 1351 a of the driving unit 1350 a pushes the wheel teeth 1341 forward, the driving portion 1351 b of the driving unit 1350 b slides on the surface of the wheel teeth 1341. When the driving portion 1351 b slides to one position, the program unit controls the linear actuator 1380 a to stop outputting power to the driving unit 1350 a , and in turn controls the linear actuator 1380 b to output power to the driving unit 1350 b . The driving unit 1350 a resets to the clockwise rotation by the reset unit, while the driving portion 1351 a slides on the surface of the wheel teeth 1341, and the driving portion 1351 b pushes the wheel teeth 1341. The driving units 1350 a and 1350 b alternately pushes the driving wheels 1340.

Similarly, both the driving unit 1350 a and the driving unit 1350 b can independently implement the driving method or principle described above.

It should be noted that, in other embodiments of the present invention, more driving units can be arranged in the driving unit, or more driving portions are disposed on each driving unit, or the driving wheel includes more sub-wheels. Therefore, different driving units respectively push the corresponding sub-wheel to rotate.

FIG. 7 a and FIG. 7 b are schematic views of two driving portions 1451 a and 1451 b of a driving unit 1450 cooperating with two sub-wheels 1440 a and 1440 b , respectively according to yet another embodiment of the present invention. FIG. 7 b is a right view of the partial teeth structure of the sub-wheels 1440 a and 1440 b in FIG. 7 a.

As shown in FIG. 7 a and FIG. 7 b , in the embodiment of the present invention, the driving unit 1450 includes two driving portions 1451 a and 1451 b disposed left and right, while the driving wheel includes two fixedly connected sub-wheels 1440 a and 1440 b disposed on the left and right (that is, two sub-wheels can move simultaneously). The driving portions 1451 a and 1451 b cooperate with the sub-wheels 1440 a and 1440 b , respectively, and the pivot shaft 1460 is disposed on the same side of two sub-wheels 1440 a and 1440 b . In the embodiment of the present invention, the driving portion 1451 a or 1451 b can respectively push the wheel teeth 1441 a or 1441 b forward. Their working principles and operating modes are consistent with the foregoing embodiments.

In addition to driving portion 1451 a or 1451 b operating independently, the embodiment of the present invention can also adjust the distance between the front ends of the driving portions 1451 a and 1451 b , or adjust the offset degree of the wheel teeth 1441 a and 1441 b to make two driving portions 1451 a and 1451 b cooperate with each other. Preferably, in the embodiment of the present invention, the wheel teeth 1441 a and 1441 b are offset with degree t, as shown in FIG. 7 a and FIG. 7 b.

Obviously, in the embodiment of the present invention, two driving portions 1451 a and 1451 b reciprocate synchronously. As shown in FIG. 7 a , when the previous forward movement is completed, the driving unit 1450 starts a reset rotation, the driving portion 1451 a reaches the driving position before the driving portion 1451 b , so the driving portion 1451 a can be used to start the next forward movement instead. Or the driving unit 1450 continues the reset movement until the driving portion 1451 b reaches the next driving position to start the next forward movement.

FIG. 8 a and FIG. 8 b are still another embodiment of the present invention in which the driving unit 1550 includes two driving portions 1551 a and 1551 b disposed up and down, and driving portions 1551 a and 1551 b cooperate with the same driving wheel 1540. FIG. 8 b is a schematic view of the driving unit 1550 in FIG. 8 a.

As shown in FIG. 8 a and FIG. 8 b , the driving unit 1550 includes two driving portions 1551 a and 1551 b disposed up and down cooperating with the same driving wheel 1540, so the driving portions 1551 a and 1551 b reciprocate synchronously. The front ends of the driving portions 1551 a and 1551 b are not level with a certain distance m, therefore, the two cannot simultaneously push the wheel teeth 1541 forward, as shown in FIG. 8 a . When the driving portion 1551 b finishes the last forward movement, the driving unit 1550 performs a reset movement, obviously making the driving portion 1551 a reach the next driving position before the driving portion 1551 b . The driving portion 1551 a can be used to push the wheel teeth 1541 forward to start the next forward movement.

In other embodiments of the present invention, the driving unit may further include more driving portions, such as 3, 4 or more, which is not specifically limited herein.

FIG. 9 a - FIG. 9 b are schematic views of the assembly structure 150 of an infusion device in the initial position and the working position according to an embodiment of the present invention. FIG. 9 c is a schematic view of part of the infusion tube 130 disposed in the assembly structure 150 according to an embodiment of the present invention.

As described above, the infusion device of the embodiment of the present invention further includes an infusion tube 130 which is used as the drug infusion channel. The infusion tube 130 includes a connection end 130 a and a subcutaneous end 130 b . When the connection end 130 a connects the drug outlet 20 and the subcutaneous end 130 b enters the subcutaneous, the drug can be delivered to the subcutaneous through the infusion tube 130.

It should be noted that there are various manners in which the connection end 130 a connects the drug outlet 20, or in which the subcutaneous end 130 b enters the subcutaneous, or the order of the two steps may be different, which is not specifically limited herein.

The infusion tube 130 includes a hard needle or a cannula. Using hard needle can increase the strength of the infusion tube 130. Using the cannula can increase the flexibility of the design of the infusion tube 130. Specifically, in the embodiment of the present invention, the entire infusion tube 130 is a hard needle or a cannula.

In yet another embodiment of the present invention, the infusion tube 130 includes a hard needle and a cannula connected with each other. That is, the infusion tube 130 includes multiple parts. For example, the connection end 130 a is a hard needle while the subcutaneous end 130 b is a cannula; or the connection end 130 a is a cannula while the subcutaneous end 130 b is a hard needle, which improves the flexibility of the infusion device structure design.

In another embodiment of the present invention, both the connection end 130 a and the subcutaneous end 130 b are hard needles or cannulas. At this time, the portion connecting the connection end 130 a and the subcutaneous end 130 b may be a hard needle or a cannula, or a closed structure with a cavity, that is, the connection end 130 a , the subcutaneous end 130 b and this said portion here make up the infusion tube 130, which is not specifically limited herein.

In the embodiment of the present invention, the infusion device further includes an assembly structure 150. A part of the infusion tube 130 is provided in the assembly structure 150, as shown in FIG. 9 c.

While in the initial position, the assembly structure 150 protrudes from the surface of the infusion device case, and the connection end 130 a does not connect with the drug outlet 20, neither does the subcutaneous end 130 b enter the subcutaneous, as shown in FIG. 9 a . While installed from the initial position to the working position, the assembly structure 150, the top of which is integrated with the infusion device case, enters the infusion device, and the connection end 130 a connects the drug outlet 20, and the subcutaneous end 130 b enters the subcutaneous, as shown in the FIG. 9 b . Obviously, in the embodiment of the present invention, the assembly structure 150 supports the infusion tube 130 to move synchronously as a whole.

Before using, the assembly structure 150 carries the infusion tube 130 in the initial position. When the infusion device is attached on the surface of the human body by the medical adhesive tape 160, the assembly structure 150 is pressed to complete the installation operation, so the infusion tube 130 becomes a bridge connecting the body fluid and the drug storage unit 1110, and the infusion device can start working normally. Compared with other installation methods, the installation method of the embodiment of the present invention reduces the user's operation steps during installation, making the installation more convenient and flexible, and improving the user experience.

The infusion tube 130 can be arranged in the assembly structure 150 in various ways, which is not specifically limited herein. In another embodiment of the present invention, the assembly structure 150 can be controlled to be automatically, not manually, installed from the initial position to the working position.

In another embodiment of the present invention, the subcutaneous end 130 b is a cannula. After the assembly structure 150 is installed in the working position, the subcutaneous end 130 b is manually penetrated by the user. In yet another embodiment of the present invention, the subcutaneous end 130 b is a cannula. The user can pierce the subcutaneous end 130 b under the skin firstly, and then install the assembly structure 150 to the working position, thus helping the connection end 130 a connect the drug outlet 20.

It should be noted that in other embodiments of the present invention, the assembly structure 150 may not be provided, but the infusion tube 130 is directly fixedly installed in the infusion device. While the infusion device is attached to the skin, the subcutaneous end 130 b penetrates under the skin synchronously.

FIG. 10 is a schematic view of the drug outlet 20, the transitional connection member 30, and the infusion tube 130 connected with each other according to an embodiment of the present invention.

The embodiment of the present invention further includes a transitional connection member 30. The transitional connection member 30, one end of which is connected with the drug outlet 20, is disposed outside the drug outlet 20. In some embodiments of the present invention, since the infusion tube 130 is not always connected with the drug outlet 20, the transitional connection member 30 can prevent the drug from leaking. Preferably, in the embodiment of the present invention, the transitional connection member 30 is a connection cavity. When the assembly structure 150 is installed to the working position, the connection end 130 a enters the connection cavity to achieve connection with the drug outlet 20.

In another embodiment of the present invention, the transitional connection member 30 is a connection port. When the assembly structure 150 is installed to the working position, the connection end 130 a is connected to the connection port to achieve connection with the drug outlet 20.

It should be noted that the transitional connection member 30 is a part of the drug storage unit 1110 or a separate structure, which is not specifically limited herein.

In summary, the present invention provides a high reliability drug infusion device in which the reset unit includes both an elastic reset component and a linear-actuated reset component. The elastic reset component can operate alone or cooperate with the linear-actuated reset component to improve the reliability of the infusion device and increase the users flexibility in choosing the infusion method.

While the invention has been described in detail with reference to the specific embodiments of the present invention, it should be understood that it will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims. 

1. A high reliability drug infusion device, comprising: a drug storage unit including a drug outlet; a screw connected to a piston and a driving wheel provided with wheel teeth, wherein the driving wheel drives the screw to move by rotation, pushing the piston, provided in the drug storage unit, forward; at least one driving unit cooperating with the driving wheel, wherein the driving unit comprises at least one driving portion; a power unit and a reset unit connected to the driving unit, wherein the reset unit comprises an elastic reset component and a linear-actuated reset component, and the elastic reset component alone or together with the linear-actuated reset component apply a force to control a reset movement of the driving unit, and, when the power unit outputs a force on the driving unit, the driving unit rotates around a pivot shaft, driving the driving portion to push the wheel teeth, thus rotating the driving wheel; when the reset unit outputs the force on the driving unit alone, the driving unit performs a reset rotation without the driving portion pushing the wheel teeth, thus making the driving wheel stop rotating; and an infusion tube, used as a drug infusion channel, and comprising a connection end and a subcutaneous end, when the connection end is connected with the drug outlet and the subcutaneous end enters a subcutaneous, a drug is delivered subcutaneously through the infusion tube.
 2. A high reliability drug infusion device of claim 1, wherein the at least one driving portion comprises two driving portions, and under a cooperative operation of the power unit and the reset unit, the two driving portions alternately push the wheel teeth.
 3. A high reliability drug infusion device of claim 2, wherein the two driving portions alternately push the wheel teeth disposed on the driving wheel.
 4. A high reliability drug infusion device of claim 2, wherein the driving wheel includes two sub-wheels provided with the wheel teeth, and the two driving portions respectively alternately push the wheel teeth disposed on the two sub-wheels.
 5. A high reliability drug infusion device of claim 1, wherein the power unit and the linear-actuated reset component are an electrically driven linear actuator or an electrically heated linear actuator.
 6. A high reliability drug infusion device of claim 5, wherein the electrically driven linear actuator includes a shape memory alloy.
 7. A high reliability drug infusion device of claim 1, wherein the elastic reset component at least comprises a spring, an elastic sheet, an elastic plate, an elastic rod, or elastic reset rubber.
 8. A high reliability drug infusion device of claim 7, wherein the at least one driving portion includes one driving portion, and the elastic reset component is a spring.
 9. A high reliability drug infusion device of claim 1, further comprising a transitional connection member which is disposed outside the drug outlet, wherein one end of the transitional connection member connects with the drug outlet, while an other end of the transitional connection member is used to connect the connection end.
 10. A high reliability drug infusion device of claim 9, wherein the transitional connection member comprises a connection cavity or a connection port.
 11. A high reliability drug infusion device of claim 1, further comprising a program unit, which is connected to the power unit and the linear-actuated reset component, and according to infusion requirements, the program unit controls to output the force from the power unit or the linear-actuated reset component. 